多线程下载时HTTP response code: 416 解决方案_下载unity response status was 416

今天用java写的多线程下载报错，找了很久，发现是第一次请求服务器时响应码正常，开启多线程部分的响应码为416，响应码对应的意思可以去这里看看点击打开链接。主要意思就是public void setRequestProperty (String field, String newValue)出现了错误，设置的下载字节范围和访问文件大小有出入，要么就是上面确认各个线程的下载范围出现问题，要么就是该语句没用对。将之前的每个线程下载字节范围都打印出来发现没问题。后来查看setRequestProperty相关资料发现是setRequestProperty("Range", "bytes：" + threadStart + "-" + threadEnd)这里出错了，bytes后面应该是=号而不是：

附上没有完成断点下载的多线程下载代码.

（我用的是某马的74期的视频学习的，而他的代码用的是：却可以运行，有点郁闷，，还有他的getFileName（）方法中获取/的索引后没有+1就截取文件名得到的是/feiq.exe, 那也是错误的,后面运行时会报错拒绝访问)

package com.lyle.study;
 
import java.io.File;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class UpDownload1 {
 
	public static String path = "http://192.168.56.1:8080/itheima74/feiq.exe";
	public static int threadCount = 3;
 
	public static void main(String[] args) {
 
		try {
 
			URL url = new URL(path);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");
			connection.setConnectTimeout(1000 * 10);
 
			if (connection.getResponseCode() == 200) {
				long length = connection.getContentLength();
 
				RandomAccessFile randomAccessFile = new RandomAccessFile(new File(getFileName()),
						"rw");
				randomAccessFile.setLength(length);
				randomAccessFile.close();
 
				long threadSize = length / threadCount;
 
				for (int i = 0; i < threadCount; i++) {
					int threadId = i;
					long threadStart = threadId * threadSize;
					long threadEnd = (threadId == threadCount - 1 ? length - 1 : (threadId + 1)
							* threadSize - 1);
 
					new DoThreadOpen(threadStart, threadEnd).start();
 
				}
 
			}
		} catch (Exception e) {
 
			e.printStackTrace();
		}
 
	}
 
	public static class DoThreadOpen extends Thread {
 
		private long threadStart;
		private long threadEnd;
 
		public DoThreadOpen(long threadStart, long threadEnd) {
			this.threadEnd = threadEnd;
			this.threadStart = threadStart;
		}
 
		@Override
		public void run() {
 
			try {
 
				URL url = new URL(path);
				HttpURLConnection connection = (HttpURLConnection) url.openConnection();
				connection.setRequestMethod("GET");
				connection.setConnectTimeout(1000 * 10);
 
				connection.setRequestProperty("Range", "bytes=" + threadStart + "-" + threadEnd);
 
				int code = connection.getResponseCode();
 
				if (code == 206) {
					InputStream inputStream = connection.getInputStream();
					RandomAccessFile randomAccessFile = new RandomAccessFile(
							new File(getFileName()), "rw");
					randomAccessFile.seek(threadStart);
 
					byte[] buffer = new byte[1024];
					int len;
					while ((len = inputStream.read(buffer)) != -1) {
						randomAccessFile.write(buffer, 0, len);
 
					}
					
					inputStream.close();
					randomAccessFile.close();
 
				}
 
			} catch (Exception e) {
 
				e.printStackTrace();
			}
 
		}
 
	}
 
	private static String getFileName() {
 
		return path.substring(path.lastIndexOf("/") + 1);
	}
 
}